There are use-cases where a load balancer should have multiple VIP addresses allocated from the same Neutron network. Users can specify additional subnet_id/ip_address pairs to bring upon the VIP port. This will allow for situations like having an LB with both IPv4+IPv6 or being exposed to both public and private subnets.

This would extend the load balancer API to support it. Example:

"additional_vips": [
  {
    "ip_address": "10.0.0.2", # This is optional
    "subnet_id": "a0304c3a-4f08-4c43-88af-d796509c97d2"
  },
]

https://storyboard.openstack.org/#!/story/2005608
https://review.opendev.org/#/q/%22Story:+2005608%22